C1, 107 and Aygo suffer from this problem badly over time, do not replace the headlights, get this kit!

The more simple of the two kits offered, this works well, but the other kit lasts longer.

Simply sand off the yellowing and oxidation with the included sanding pads and polish to a crystal clear finish with Plast-RX. Plast-RX is what separates this kit from the rest. Once the headlight is corrected with the Meguiar's Headlight Lens Correction. Protect it with the included Meguiar's Headlight Protectant, for long lasting clarity.